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diff --git a/sysdeps/mach/hurd/net/if_arp.h b/sysdeps/mach/hurd/net/if_arp.h
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+/* Definitions for Address Resolution Protocol.
+   Copyright (C) 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+/* Based on the 4.4BSD and Linux version of this file.  */
+
+#ifndef _NET_IF_ARP_H
+
+#define _NET_IF_ARP_H 1
+#include <sys/cdefs.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+
+__BEGIN_DECLS
+
+/* Some internals from deep down in the kernel.  */
+#define MAX_ADDR_LEN	7
+
+
+/* This structure defines an ethernet arp header.  */
+
+/* ARP protocol opcodes. */
+#define	ARPOP_REQUEST	1		/* ARP request.  */
+#define	ARPOP_REPLY	2		/* ARP reply.  */
+#define	ARPOP_RREQUEST	3		/* RARP request.  */
+#define	ARPOP_RREPLY	4		/* RARP reply.  */
+
+/* See RFC 826 for protocol description.  ARP packets are variable
+   in size; the arphdr structure defines the fixed-length portion.
+   Protocol type values are the same as those for 10 Mb/s Ethernet.
+   It is followed by the variable-sized fields ar_sha, arp_spa,
+   arp_tha and arp_tpa in that order, according to the lengths
+   specified.  Field names used correspond to RFC 826.  */
+
+struct arphdr
+  {
+    unsigned short int ar_hrd;		/* Format of hardware address.  */
+    unsigned short int ar_pro;		/* Format of protocol address.  */
+    unsigned char ar_hln;		/* Length of hardware address.  */
+    unsigned char ar_pln;		/* Length of protocol address.  */
+    unsigned short int ar_op;		/* ARP opcode (command).  */
+#if 0
+    /* Ethernet looks like this : This bit is variable sized
+       however...  */
+    unsigned char __ar_sha[ETH_ALEN];	/* Sender hardware address.  */
+    unsigned char __ar_sip[4];		/* Sender IP address.  */
+    unsigned char __ar_tha[ETH_ALEN];	/* Target hardware address.  */
+    unsigned char __ar_tip[4];		/* Target IP address.  */
+#endif
+  };
+
+
+/* ARP protocol HARDWARE identifiers. */
+#define ARPHRD_NETROM	0		/* From KA9Q: NET/ROM pseudo. */
+#define ARPHRD_ETHER 	1		/* Ethernet 10Mbps.  */
+#define	ARPHRD_EETHER	2		/* Experimental Ethernet.  */
+#define	ARPHRD_AX25	3		/* AX.25 Level 2.  */
+#define	ARPHRD_PRONET	4		/* PROnet token ring.  */
+#define	ARPHRD_CHAOS	5		/* Chaosnet.  */
+#define	ARPHRD_IEEE802	6		/* IEEE 802.2 Ethernet/TR/TB.  */
+#define	ARPHRD_ARCNET	7		/* ARCnet.  */
+#define	ARPHRD_APPLETLK	8		/* APPLEtalk.  */
+#define ARPHRD_DLCI	15		/* Frame Relay DLCI.  */
+#define ARPHRD_METRICOM	23		/* Metricom STRIP (new IANA id).  */
+
+/* Dummy types for non ARP hardware */
+#define ARPHRD_SLIP	256
+#define ARPHRD_CSLIP	257
+#define ARPHRD_SLIP6	258
+#define ARPHRD_CSLIP6	259
+#define ARPHRD_RSRVD	260		/* Notional KISS type.  */
+#define ARPHRD_ADAPT	264
+#define ARPHRD_ROSE	270
+#define ARPHRD_X25	271		/* CCITT X.25.  */
+#define ARPHRD_PPP	512
+#define ARPHRD_HDLC	513		/* (Cisco) HDLC.  */
+#define ARPHRD_LAPB	516		/* LAPB.  */
+
+#define ARPHRD_TUNNEL	768		/* IPIP tunnel.  */
+#define ARPHRD_TUNNEL6	769		/* IPIP6 tunnel.  */
+#define ARPHRD_FRAD	770             /* Frame Relay Access Device.  */
+#define ARPHRD_SKIP	771		/* SKIP vif.  */
+#define ARPHRD_LOOPBACK	772		/* Loopback device.  */
+#define ARPHRD_LOCALTLK 773		/* Localtalk device.  */
+#define ARPHRD_FDDI	774		/* Fiber Distributed Data Interface. */
+#define ARPHRD_BIF      775             /* AP1000 BIF.  */
+#define ARPHRD_SIT	776		/* sit0 device - IPv6-in-IPv4.  */
+
+
+/* ARP ioctl request.  */
+struct arpreq
+  {
+    struct sockaddr arp_pa;		/* Protocol address.  */
+    struct sockaddr arp_ha;		/* Hardware address.  */
+    int arp_flags;			/* Flags.  */
+    struct sockaddr arp_netmask;	/* Netmask (only for proxy arps).  */
+    char arp_dev[16];
+  };
+
+/* ARP Flag values.  */
+#define ATF_COM		0x02		/* Completed entry (ha valid).  */
+#define	ATF_PERM	0x04		/* Permanent entry.  */
+#define	ATF_PUBL	0x08		/* Publish entry.  */
+#define	ATF_USETRAILERS	0x10		/* Has requested trailers.  */
+#define ATF_NETMASK     0x20            /* Want to use a netmask (only
+					   for proxy entries).  */
+#define ATF_DONTPUB	0x40		/* Don't answer this addresses.  */
+#define ATF_MAGIC	0x80		/* Automatically added entry.  */
+
+
+/* Support for the user space arp daemon, arpd.  */
+#define ARPD_UPDATE	0x01
+#define ARPD_LOOKUP	0x02
+#define ARPD_FLUSH	0x03
+
+struct arpd_request
+  {
+    unsigned short int req;		/* Request type.  */
+    u_int32_t ip;			/* IP address of entry.  */
+    unsigned long int dev;		/* Device entry is tied to.  */
+    unsigned long int stamp;
+    unsigned long int updated;
+    unsigned char ha[MAX_ADDR_LEN];	/* Hardware address.  */
+  };
+
+__END_DECLS
+
+#endif	/* net/if_arp.h */